Usually around 30 days. You can strip them at around 20 days and the fry will have absorbed half of the egg sack by then. That is my experience with c. leptosoma, not sure about the Jumbo's though it's probably the same time frame.
I understand that temperature plays a large role in the development time of the fry. I keep my fry tank a couple of degrees warmer than the main tank. And of course there is no substitute for clean fresh water. Keep up the water changes :fish:
My fry have absorbed their egg sac around day 20 or so, but my adult females will hold longer if they feel threatened. There's also a difference between my wild caught cyps who hold longer than their F1 offspring.. but they're kept in very different set ups, so it's likely due to the environmental variables. I have observed that females who hold beyond 25 days tend to be in poor shape and take longer to regain body mass and color.